package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /*
    * 添加购物车
    * */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {

        // 判断当前加入购物车得的商品是否存在(菜单id或者套餐id、dishflavor)
        ShoppingCart shoppingCart = new ShoppingCart();

        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        // 存在，+1
        if(list!=null &&list.size()!=0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.update(cart);
        }else {
            // 不存在，插入
            Long dishId = shoppingCartDTO.getDishId();
            Long setmealId = shoppingCartDTO.getSetmealId();
            // 判断是菜品还是套餐
            if(dishId != null){
                // 菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);



        }

        // 不存在，插入

    }
    /*
    *查看购物车
    *
     */
    @Override
    public List<ShoppingCart> list() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }
    /*
    * 清空购物车
    * */
    @Override
    public void delete() {
        shoppingCartMapper.delete(BaseContext.getCurrentId());
    }

    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {

        // 当前菜品减1
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list!=null &&list.size()!=0){
            ShoppingCart cart = list.get(0);
            if(cart.getNumber()==1){
                // 直接删除该菜品、套餐
                shoppingCartMapper.deleteDishOrSetmeal(cart);
            }
            cart.setNumber(cart.getNumber() - 1);
            shoppingCartMapper.update(cart);
        }


    }
}
